Under cover of darkness, something evil is at work in Hyde River, an old mining town deep in the mountains. Its latest victim, nature photographer Cliff Benson, was brutally killed while camping -- and his wife Evelyn has been driven nearly mad by what she saw, but she can"t remember what it was. The sheriff thinks a rogue bear killed Cliff. But townspeople whisper -- and Cliff"s death is just the latest in a long string of bizarre "accidents." Cliff"s brother Steve is determined to find out the truth about what"s concealed in the old caverns near Hyde River, a mystery that the local folk legends only hint at.